Sheet-metal box.



A. E. BLACKMAN.

SHEET METAL BOX.

APPLIoATIoN FILED JULY 22, 1909.

Patented July 5,-

provided with a hole 19 to form UNIT-E SHEET-METAL BOX.

Specification of Letters Patent. Application led July 22, 1909. SerialNo. 508,890.

Patented July 5, 1910.

To all whom t may concern.' y Be it known that I, ALBERT E. BLACKMAN,

la`"\citizen of the United States, residing at 4embodiment of mylnvention, Figure 1 is a plan view of the blank of the box before beingfolded up; Fig. 2 is a bottom plan View of the blank for the-cover; Fig.3 is a central longitudinal section of the cover and box after beingfolded up and fastened toget'her; and Fig. 4 is an enlarged detail.

In met-al boxes for use as switch boxes or cut-out boxes, cheapness ofconstruction is a material factor, and' one of the-'comparativelyexpensive parts of the cost of assembling such a box is the pivotconnection between` the cover and the main body of the box. By myconstruction I have dispensed with the necessity of any separate pivotconnections such as are usually employed, thereby'reducing the cost ofthe box, and haveA attained other advantages. The blank shown in Fig. lis supposed to be folded up on the dotted lines 1., 2, 3 and 4 to form abottom 5, with end portions 6 and7 and side portions 8 and 9. The endportions have wings 10, 11, which are folded inwardly on the -dottedlines 12 'and 13, which may extend inside the sidelportions as shown inFig. 3 if desired, and maybe fastened tothe sides by rivets 14 passedthrough ,the holes 15 and 16. 17 represents partially punched-- outportions of the box to make so-called knock-out openings if desired. Thesides 8 and 9 are provided with integral portions 18 which extend beyondthe end portions 6 and 7, when the box is folded up into-shape as shownin Fig. 3, and each of them isf a pivot for` the cover, as hereafter exlained.

The cover 20 shown in ig. l2is folded up on the dotted lines so as toinclose thefbox when turned down uponthesame by the- 'end portions 21,-`22 and side portions 23, v.

'24. The side portions 23, 24v of the .cover also have integral lu orextensions v25, 26, perforated' at 27, 8. The lugs 25, 26

are placed outside -of the box, as indicated by dotted lines in Fig. 3and also in Fig. 4, with the end portion 21 of the vcover inside of the`extensions 18 and rivets 28 through the holes 19 and 25 form a pivotbetween the cover andthe main portion of the box. The cover may be swungdown to completely inclose the box.

This construct-ion makes an simple and `cheap device.

As the extensions v18, when the box is assembled, inclose thel endVportion 21 of the cover, the cover when it 1s swung open to the extentshown in Fig. 4, will cause the shoulders 29 to abut against the end 'ofthe extensions 18, as shown in Fig. 4, and form a stop for the cover.The inside width of the cover, when Afolded up, is obviously such thatthe portions 23, 24 stand outside ofthe side walls 8 and 9 of the `mainportion of the body. It is preferable to have the end portions 21, 22 ofthe cover also inclose the end walls 6 and 7 ofthe box.

. I do not limit myself to the specific construction shown in thedrawings, as many changes may be made without departing from the spiritof my invention as claimed.

What I claim is:

A sheet metal box composed of a single sheet of metal folded up on foursides to form the walls of the box, and rovided with integral portionsof each side extending beyond the adjacent wall to form a supextremelyport for a pivotal c'iinection, a cover forl the box formed of asingleblank of sheet metal having its edges folded to fit ,the box andprovided at opposite sides with inte al extensions outside of theadjacent walITof said box and fastened to the integral extensions fromsaid box by a pivotal connection, the turned over edge of one end ofsaid cover which is adjacent the pivotal connectiont'o the body of thebpx being located inside of the integral extensions from themain portionof the box but the end wall of said box tact therewith.

' Signedlat New York city, N. Y. this 20th dayf July, 1909.

ALBERT Witnesses:

BEATRICE MIRvIs,

IDA G. GILMoRn.

overlapping vand free from con- E. BLACKMAN.

